The Flying Dutchman was once a live pirate who sailed the seven seas along with his crew; the Pirate Ghosts. After he died, his body was used as a maniquin for a store and was never put to rest. He now haunts the seven seas along with his crew, and his ghostly ship. He is a recurring character from wikipedia: SpongeBob SquarePants

The Flying Dutchman made an appearance as non-playable character in Nicktoons Unite!. When the party arrives at The Flying Dutchman's ship, they were stopped by The Flying Dutchman. He said that everyone was cursed and had to stay on his ship. When he saw SpongeBob he said that he could go, but SpongeBob wanted to stay with the rest. The Flying Dutchman then said that if they find his old crew back they were allowed to leave. When collected all the crew members The Flying Dutchman took off and with the anchor, opened the door so the heroes could go to The Jellyfish Factory.